メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.0250000 36.3125000, 139.0312500 36.3125000, 139.0312500 36.3166667, 139.0250000 36.3166667, 139.0250000 36.3125000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral